Page Design and Content © Obsessive Compulsive Design or the individual author except where otherwise stated.

OCD are a small games design company based in SE England. Our flagship product is the obSESSION Cross-Genre RPG System but we also make a small number of card games and have plans for further expansion.

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obSESSIVE Compatibility


Compatibility is a major issue with obSESSION™. Because the system is designed around the concept of internal consistency it becomes important that the game's rules adhere to that consistency and remain cross-compatible.

In theory any Character from any obSESSION™ Game could be transferred to any other game with no compatability issues.

In practice, of course, this is harder to arrange than it sounds. The way that we have chosen to handle it is through the application of oC and NoC designations to any game using the obSESSION™ Core. These are very simple:


A game is either 100% obSESSION™ Compatible, using no variant or unusual rules that could affect cross-compatibility (an oC game);


Or the game uses the Core obSESSION™ rules but introduces variants or new rules that are not necessarily completely compatible with other games (a NoC game).


These designations are voluntary and are assigned by the game's creator, whether the company publishing a commercial game or the GM designing a new game for his own group. In order to avoid confusion and disappointment you should always assume a NoC rating for any game that does not specify and should always assign a NoC rating to your own game if you are not sure that it is 100% compatible.


The graphics found below are designed to provide an easy, at-a-glance, way of identifying a product as 100% oC or not. The obSESSION™ style d10 graphic to the left indicates a NoC product, something built with the obSESSION™ Core, while the one on the right denotes a oC product by adding the letter C in the appropriate font. Feel free to right-click and save these images for use on your own obSESSION™ projects.